olson



- Feb. 19, 1929. 1,702,520

C. G. OLSON 4 HOB GRINDING MACHINE Filed 1, 1926 4 Sheets-Sheet l fvvexv-ron CARL OLSON euwu 7 A 'rrys.

Feb. 19, 1929.

C. G. OLSON H01; GRINDING MACHINE Filed May 1, 1926 4 Sheets-Sheet 2 'Tl'sx am- \I NVEN TOR G: OLSON rQMQ Arrrs Qllu CARL 1 (QZewe/u Feb. 19, 1929. 1,702,520

c. G. OLSON nos GRINDING wacrmm Filed May 1, 1926 4 Sheets-Sheet 5 67 NVENTOR CARL. G:- OLso/v C. G. OLSON HOB GRINDING MACHINE Feb. 19, 1929. 1,702,520

Filed May 1. 1926 4 SheetS- -Sheet 4 l5 if? [/VVE/VTOR GIRL GOLso/v BYQZmw-uu Arrrs.

Patented Feb. 19, 1929.

UNETED STATES PATENT OFFICE.

OAR-L G. OLSON, OF CHICAGO, ILLINOIS. ASSIGNOR TO ILLINOIS TOOL WORKS, OF CHICAGO, ILLINOIS, A CORIORATION OF ILLINOIS.

HOBGRINDING IIIACHINE.

Application filed May 1, 1926. Serial No. 105,966.

My invention relates to machines for grinding hobs and like articles, and the ob ject of the invention is to simplify machines of this class and also to provide a construction which will make for accurate work and for ease of adjustment and mani n'llation by the operator. A further object is to provide automatic means for making certain adj ustments and corrections in the operation of the machine. I accomplish th se objects by the mechanism illustrated in the accompanying drawings in which Figure 1 is a front elevation of the machine partly in section.

Figure 2 is a top plan view partly in section showing the tool holder or grinder head and associated parts.

Figure 3 is a detail view illustrating the manner in which the grinding wheel may be reversed to grind opposite sides of the hob teeth.

Figure l is an end elevation looking toward the left in Figure 1.

Figure 5 is a sectional elevation showing the tool holder and associated parts. In this view the tool holder is shown to be adjusted to the center of the sector plate or quadrant.

Figure 6 is an elevation looking toward the left of Figure 5. This view is partly in section.

Figure 7 is an elevation looking toward the left of Fig. 6.

Figure 8 is similar to Figure 1 but shows the grinding hcad reversed to grind the opposite side of the hob teeth.

Figure 5) shows a modified form of tool holder and support. In this form the tool holder is automatically raised or lowered as it is reversed to bring the grinding wheel in proper position on the hob tooth.

Figure 10 is a diagram illustrating the ap plication of the machine to hobs having small teeth. The action illustrated is in accordance with the construction shown in Figures 1 to 8 inclusive.

Figure 11 is a diagram illustrating the application of the machine to hobs having larger hob teeth and where a correction is necessary in reversing from one side of the tooth to the other in a straight gash hob. The diagram illustrates the operation of the mot i lied form shown in Figure 9.

Like numerals denote like parts throughout the several views.

Referring first to the form shown in F igures 1 to 8 inclusive, the hob 15 is mounted upon a spindle 16, journaled in a bearing 17, mounted in a rocking frame 18. The outer end of the spindle is in the form of a lead screw which works within a nut- 22 mounted in the said rocking frame. The lead of the screw is the same as in the hob to be ground. Thus spindle 16 has two bearings, one of which is in the form of a lead nut, and it is evident that when the spindle rotates it will simultaneously move in an axial direction in accordance with the helical lead of the hob teeth.

Spindle 16 is rotated by means of a gear 24 meshing with a Wide face pinion 26 which has a fixed axis in the main frame or bed 27. It is rotated by means of gearing including the gear 28 shown at the left of Figure 1. The rocking frame 18 oscillates back and forth upon the main frame to bring the hob toward and from the grinding wheel 30 to produce the necessary relief in the hob teeth. The mechanism for accomplishing this purpose need not be described for it is not intimately concerned with my present invention and flu'thermore is described and shown in detail in my prior Patent No. 1,575,713.

Referring now to the parts more closely concerned with my present invention:

A slide 32 is mounted on the main franie 27 and is controlled by a feed screw 3% provided with a handle 35 in the usual manner. Transversely mounted on slide 32 is a second slide 36 adjustable by means of a screw 37 provided with a knurled head 38. These slides 32, 36 and their associated parts constitute a tool post or compound rest. On the upper slide 36 is an element 40 which for convenience may be termed a sector plate. It carries the grinder head which will presently be deseribed. Said plate is rockable on slide 36 in order that the grinder wheel may be adjusted to the helix angle of the hob to be ground. It has, on the bot-tom two rockers 42 which rest in channels 1 1 in the slide as best shown in Figures 4 to 7. The sector plate is held in the position to which it is adjusted by means of an anchor bolt 46 best shown in Figures 5 and 6. This bolt is secured to slide 36 and at the upper end has 1 www Lani q vi LL. rious degrees to harmonize with angle in the huh which if eing ix 2i? 1. :uljustnieni' also provides ilk)! the n i' righilltiihi er 11:51 hzuui huhu. in en" 1' in Ge iIOIllilflG the angle of iii? ihe f-uii'iii piuie provided 'wiih :1 i-zuhmleii -iczzie 52) min in cooperate will] a whim line 51!; iiiiii' en ssiiiie 86 us she n in "igure At the center 01: CHIVZI iHL'Q of i'he eel-01" plate 4:0 .155 :1 Stud ehewu at the !.0 (er left corner (:1 1 "UPC 5 anal elaaewhe': This iei'nu; q a f;

u a i rvnl b 1 pin) mi he Mini e1 new i e 1 1 1:1 iwlflyvu L (lihCllUGL. A, M in US ewe \LL 1 i hula 1s app (minutely \ertiezn. ihe iiu' uity (lepei'ldingz upon the angle in wine 1 the seeker plate 155 tilted for uu usiilueni iv the helix; un-

' i eir le in g'ie of the hoh. Tlhe (lei and (haul e Figuire 6 ujulicuiies me p0, 011 0 ii the huh anal 1t will he noted illilt the axis of he si'ual would, ii produced, pin-is near but outside of said circle.

The base 58 of the grinder he iiui'ei'l (0 receive suiil pivot pin inis hehl zieli'iingly in close eentiu-t with 'i'he seeioi plate by menus: e? a lean? spring); which iuuleili H ihe l eznl 0f (he pin })IQSS$ ilewn upen the said grinder hen Ll hu e. 'ihe lease of the grinder mend is arched so as Le elezur the anchor helt if; 515; shown in i; The ()HiQi end of (he said l 51:

ET'lU 0. A 1.1.x ine'lv upeu lhe upuei eiiphelui suihe sea-huplui-e :ii i has lepeniling for engaging the Olliffii vim (hei parts are bevel ul in ere eleuieni' l1 ilv' sealed.

hlhel;

eihg'e ei i'he were? pini'e zinc. is hueke i f set SCI'QW (iii. l m xing pin 68 in ezu'i'i'ui h i'he grin-lei: hezul huue :uul uh-pied in Cm iui'efieeheie Til 'i'ei nei'l ui' iii'fieiiml peiui'u ii the FPi'l'i) pixie. il'hese Sifl'liei'S ui'e iiisi'i'ihuled in sueh manner :u; wheel in renhu-i with i'he i ler oi erzlinui'i y iheie uie Bu heh; 1'0 eei-i'espeiul lie sine angles enualuyed in l'he melee The gzi'inilei' hemi haste has iern'iel upuu t :1 l'ieziriug' e1 holder 'i'l for a quill in which ihe grinder Wheel si inclle. T l is retutuhly mounted, This spindle in driven by u sheave 76 and heli- 78, 01 any ethei suiiiuhie means A cap 80 forms the upper gait e'l for the quill, and this cup is nus] down in place by latches 82.

l he machine is equipped with a too 1 i hi i' e' ilei'iee which ueeei'iliug to the iliusi'ru n, he :i hi Ly 84 equipped with iZWO i'h i h ene'ircle the quill at e ther end of the i, [ll heldei. Cemequenily the (ileum! viee re ble about the axis 0' the quill 70 he n. (he of the rings is split and is pad in posi ien by means 0i? 21 eiuniping hellv 88. A hour; is secured in the body oi the hes 111g device and lihis forms a Ede fey :1 sliding bar 92 which is previcled 7' e (liunieinl pein'i: 93 fin: (he he my; Wheel 13:11 )2 is i'eeipi'ei EXOUPHSLU'Y h an epei'zii'ing: need net he hei'ei'i iii J i in ihe lie lie it may will he lea. the way 01: the huh and adjacent punts of the in :1 y (If its positions I 1 90 w'. I" e i, $1 1 1 I in pm nice the iLaZLh villi we I} us s-rhe an 111 FQ'UYQS 1 to 8 inclusive. The sector will he ti i bring the exuding l Mul (he 22ml cans:

ins

=: 10 grinding 111) :iheie "Pen: 111

l ihe pin;

l 322140 he puinii (4 wheel indies-At lit 3H also u nee iii'oin (he heh airis in m re emunznainnfill negligihle, Tin

ure 10. The hob tooth 100 has 1 trout line 1.01 which, being parallel to the axis of the hob as in a straight gash hob, is not at right angles to the sides of the tooth. The grinding wheel. should start tangentially at the front of the tooth, but when adjusted, as showin it will be a little above the trout ot the tooth when at one side. as indicated by the full line circle 72/ and will be a little below the front line ot the tooth when on the opposite side as shown by the dot and dash circle h.

ln grinding hobs having larger teeth this error 'annot be neglected and an adj ust-mentshould be made. and l. have provided for such adjustment by the mechanism shown in Figure 9. In this case the base 58 ot the grinder head is fastened to a s:rew 110. which worlts in a threaded boss Ill, and the resu t is that when the grinder head swings from one angular position to the opposite one to grind the opposite side at the tooth the grinding wheel will be automatically lowered or raised" as the case may be. To harnmnizae with this movement the outer periphery 112 of the sector plate is of helical "form. The operation is illust 'ated in Figure ll where the larger tooth llel has a straight trout 115. The grinde 'wheel when in the posit-ion shown by the circle ll. will he tangential to the side of the tooth at the trout end, and when reversed to the dotand dash position l-l will be automatically raised and become tangential to the opposite side of the tooth at the trout thereof. Thus the type of machine shown in Figure 9 automatically adjusts i sel't vertically to raise and lower the grinding wheel and bring it tangential to the sides of t to hob teeth at the trout thereof.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

l. A hob grinding machine having a hob spindle. a :versible grinder hen l tor holding the grit l 0- wheel in contact with the hob. and means tor rotating the hob and simultaneously causing relative travel between the hob and the grinding wheel in accordance with the lead of the hob and a ative bodily movement radially ot the hob in accordance with the relief in the hob teethw id grinder heal being pivoted about an axis approximately perpoudiculal' lo a plane who:-e position is determined substantially by the hob axi and the grinding wheel axis.

'12. A. hob g inding machine having a horind a reversible grinder head l izconta-l hob l p a.

for holding tie grinding wheel in contact with the hob, and means for rotating the hob and .imultancously causing relative travel between the hob and the grinding wheel in accordance with the lead of the hob and a relative bodil movement radially ot the hob in accordance with the relief in the hob teeth, said grinder head being pivoted about an axis passing through the axis of the grinding wheel substantially at rightangles thereto, the grinding wheel axis being oblique to the hob axis both in a vertical and a horizontal direction.

3. A hob grinding machine having a hob spindle, a reversible grinder head for bolding the grinding wheel in contact with the hob. and means for rotating the hob and simultaneously causing relative travel between the hob and the grinding wheel in accordance with the lead of the hob and a relative bodily movement radially of the hob in accordance with the relief in the hob teeth, said grinder head being pivoted about an axis substantially perpemlicular to a plane determined approximately by the hob axis and the grinding wheel axis, the axis of the grinder head being spaced from the hob axis an amount approximately equal to the radius of the hub.

at. A, hob grinding machine having a horizontal hob spindle. a reversible grinder head for holding the grinding wheel in contact with the hob. and means for rotating the hob and simultaneously causing relative travel between the hob and the grinding wheel in accordance with the lead oi? the hob and a relative bodily movement radially of the hob in accordance with the reliet in the hob teeth.

said grinder head being pivoted about an radius oi the hob, the axis of the grinding wheel being oblique to the axis of the. hob.

5. A hob grinding machine having a hob spindle, a grinder hea d for holding the gr nd ing wheel in contact with the hob. means tor rotating the hob and simultaneously causing relative travel between the hob and the grinding wheel in accordance with the lead of the hob and a relative bodily movement radially of the hob in :uzcordauce with the relief in the hob teeth. said grinder head being pivotcd about an axis lying approximately in aplane which perpendicular to the axis of rotation ot the hob butt-ilted with respect to it to a degree equal to the helix angle of the hob whereby the iosition of the grinder wheel ma be reversed and thus act first upon oi c shit oi the hob te th and then upon the opposite side.

6. it hobgrinding machine l'iaving :1 bob spindle. means tor rotating it and sii'nultancously causing it to travel axially. a grinding wheeh a reversible e'rinder head 't'or supportiug the wheeL a support for the grinder head. the grinder head, being angzjularly adjustable on the support about an axis substantially perpendicular to and passing through the t wheel axis and passing outside ot' the hob, whereby the grinder head may be .rcversccl to bring: the

l a relief in pendiculur to and )lHSi'll tl'liOUfjfi? the grrimh mg wheel axis wh web the (Y ii'ides lead may :9 wheel ii tie hob teem, I ider head in be reversed to bri. contact with oppcs and means for securii., two (litter-cot positiois of which are oblique to the axis oi the 8 A hob grinding machine ha ry hoo spindle, ii'ieims t rclatiiicj it crud slim" iieously rousing it to t avel axially. a ing wheel, a grinder head for support wheel, a support for ti o grinder head, grinder head being angularly adjustable on the support about an axis substantially p pendicular to and passing through the g *ind ing wheel WhQIGby th tinder head be reversed to bring; the molding wheel iirtt contact with opposite sides of the hob teeth the axis of adjustment of the minder head being spaced from the hob axis a d'istauce at least as great as the rs means for caigssing relath between the hob and the in a cordance with the relic-l 9. A. hob grinding mach..: zontal hob spindle, means tor causing it to simultaneously a suliistantially llOI'lZOPt'fll sec head pivotally mom 1 s' i to d aze y rerticzr the helix in the bob, the g inder hca 'l pivot uassir side of the body of the hob, g dez: w:

an axis which is appi. tilted in accorc airc with t I l l V grinder head and 1 a i hb-mmmliy .uoimoho 1 and tl i. and iudii 19; d lien radial to hub to produce ll.- liei in tho hob teeth,

it A hob g 'iillllli 1 i v 501M111 boo spindle. meal 7 substantially horizontal pivotally mounted on axis which is approximzi ed in accort l holx the itr head p1; oi the body of the hob a ported the grinder XlS of rotation subs means for causing relatii oi the hob spindle and the griui'fi.

direction radial to the hob to produce relief in the hob teeth and means whereby the sector may be tilted to .'ercnt angles to correspond with the di lerent helical leads of the rob teeth:

11. A hob grinding machine having a hob s1 iiudle, a grinder head for holding the grindi wheel in contact with the hob, u eans for rotating the hob and simultaneously causing relative travel betwcei'i the hob and the grinding; wheel m accordance with the lead of the hob and a relative bodily movement radially of the hob accordz use with the relief in the hob teeth id der head being pivoted a =out an approximately perpendicular to a plane determined by the hob axis and the i riding wheel axis whereby the grinding H heel may be reversed to 1 1d the two sicos the hob teeth and means for automatically ing and lowering the grinder head when it is reversed.

A hob grind rinderl iii inaohiiie 1e d for holomg; the grudct with the hob, means o l a ring a hob 'el south r l c t e hob and sinmltaneously causing "Ye travel between ti o hob and the wheel in accorclaice with the lead of the an l a relativebodilymovement radially oi: the hob accordance with the reliel in the ,s H 'loltlfiy mi versed to grind op J site and means for hxmg out angular posiondmgr to the re m wheel.

' 51 :1 bob and simultai .1 a e-c-l, a suppo utter head home: swi' ll l illl SXJ'S SillJSiflllll distances hob :iXis ll wheel axis, and means for securing the grinder head in twoditi erent positions approximately at equal angular distances from a plane perpendicular to the hob axis and passing approximately through the swivel axis whereby the grinding wheel may be reversed to grind opposite sides of the hob teeth.

15. A hob grinding machine having a hob spindle, a grinder head tor holding the grinding wheel in contact with the hob, and means for rotating the hob and simultaneously cansin); relative travel between the hob and the grinding wheel in accordance with the lead of the hob and a relative bodily movement radially of the hob in accordance with the relief in the hob teeth, a support capable of movement parallel and transverse to the hob axis. a sector plate mounted on said support b1 0) to sides of the hob teeth.

l u i S. A hob grinding machine having a hob in the grinding wheel into contact with spindle, a grinde head for holding the grinding wheel in contact with the hob, means for rotating the hob and simultaneously causing relative travel between the hob and the grinding wheel in accordance with the lead of the he!) and a relative bodily movement radially or the hob in noun-dance with the relief in the hob teeth, said grinder head being pivoted about an axis lying approximately in a plane which perpendicular to the axis of rotation of the hob but tilted with respect to it to a degree equal to the helix angle of the hob whereby the position of the grinder wheel may be reversed and thus act lirst upon one side o l? the hob teeth and then upon the opposite side, the grinder head axis passing outside oi the hob.

In witness whereof, I have hereunto subscribed my name.

CARL G. OLSON. 

